Approx 6 million Poles were killed in WW2 - 50% of those were Jews.
Note that a portion of those were killed by the Ruskies when they took over part of Poland as part of a deal with the Germans and also later near the end of the war when the Ruskies aided in the elimination of Polish nationlists in order to engineer the establishement of a commie state.
Personally, I think the Poles are unwise in whinning about WW2. They took over a large portion of eastern Germany at the end of WW2 as part of a settlement and if they push things too far, they could be in for another ass kicking.
... while loosing even more territory to the Soviet-Union.